Alright, let's solve this math problem step by step. First, we have the number 387. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 34. So, we're going to take the number 387 and add it to itself 34 times.
Step 1: 0 + 387 = 387
Step 2: 387 + 387 = 774
Step 3: 774 + 387 = 1161
Step 4: 1161 + 387 = 1548
Step 5: 1548 + 387 = 1935
Step 6: 1935 + 387 = 2322
Step 7: 2322 + 387 = 2709
Step 8: 2709 + 387 = 3096
Step 9: 3096 + 387 = 3483
Step 10: 3483 + 387 = 3870
Step 11: 3870 + 387 = 4257
Step 12: 4257 + 387 = 4644
Step 13: 4644 + 387 = 5031
Step 14: 5031 + 387 = 5418
Step 15: 5418 + 387 = 5805
Step 16: 5805 + 387 = 6192
Step 17: 6192 + 387 = 6579
Step 18: 6579 + 387 = 6966
Step 19: 6966 + 387 = 7353
Step 20: 7353 + 387 = 7740
Step 21: 7740 + 387 = 8127
Step 22: 8127 + 387 = 8514
Step 23: 8514 + 387 = 8901
Step 24: 8901 + 387 = 9288
Step 25: 9288 + 387 = 9675
Step 26: 9675 + 387 = 10062
Step 27: 10062 + 387 = 10449
Step 28: 10449 + 387 = 10836
Step 29: 10836 + 387 = 11223
Step 30: 11223 + 387 = 11610
Step 31: 11610 + 387 = 11997
Step 32: 11997 + 387 = 12384
Step 33: 12384 + 387 = 12771
Step 34: 12771 + 387 = 13158

So, 387*34 = 13158